/*
 * SonarQube Java
 * Copyright (C) 2012-2025 SonarSource Sàrl
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Sonar Source-Available License Version 1, as published by SonarSource SA.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the Sonar Source-Available License for more details.
 *
 * You should have received a copy of the Sonar Source-Available License
 * along with this program; if not, see https://sonarsource.com/license/ssal/
 */
package org.sonar.java.checks;

import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import org.sonar.check.Rule;
import org.sonar.check.RuleProperty;
import org.sonar.java.IllegalRuleParameterException;
import org.sonar.java.model.LineUtils;
import org.sonar.plugins.java.api.IssuableSubscriptionVisitor;
import org.sonar.plugins.java.api.tree.SyntaxTrivia;
import org.sonar.plugins.java.api.tree.Tree;

@Rule(key = "S124")
public class CommentRegularExpressionCheck extends IssuableSubscriptionVisitor {

  private static final String DEFAULT_REGULAR_EXPRESSION = "";
  private static final String DEFAULT_MESSAGE = "The regular expression matches this comment.";

  @Nullable
  private Pattern pattern = null;

  @RuleProperty(
    key = "regularExpression",
    description = "The regular expression",
    defaultValue = "" + DEFAULT_REGULAR_EXPRESSION)
  public String regularExpression = DEFAULT_REGULAR_EXPRESSION;

  @RuleProperty(
    key = "message",
    description = "The issue message",
    defaultValue = "" + DEFAULT_MESSAGE)
  public String message = DEFAULT_MESSAGE;

  @Override
  public List<Tree.Kind> nodesToVisit() {
    return Collections.singletonList(Tree.Kind.TRIVIA);
  }

  @Override
  public void visitTrivia(SyntaxTrivia syntaxTrivia) {
    if (pattern == null && !isNullOrEmpty(regularExpression)) {
      try {
        pattern = Pattern.compile(regularExpression, Pattern.DOTALL);
      } catch (RuntimeException e) {
        throw new IllegalRuleParameterException("Unable to compile regular expression: " + regularExpression, e);
      }
    }
    if (pattern != null && pattern.matcher(syntaxTrivia.comment()).matches()) {
      addIssue(LineUtils.startLine(syntaxTrivia), message);
    }
  }

  private static boolean isNullOrEmpty(@Nullable String string) {
    return string == null || string.isEmpty();
  }
}
